Hi Live,

The following excerpt from the DKE User Manual should help answer your question.

Gradient Vectors
Select the gradient table from a list of available tables or specify a custom table. A custom table
can be a '.dat' or '.txt' file. Each row corresponds to a gradient vector [Gx, Gy, Gz]. When
specifying a custom table, remove gradients that could correspond to the B0 image [0, 0, 0].
When using a 4D NIfTi, make sure that the 4D order corresponds to the order of the gradient
table. If a DICOM set is used, DKE will order the images according to the information stored in
the DICOM tag-(0018, 0024) 'SequenceName'.

Thanks,
Corinne